Recently, I had a type 2 patient using insulin to control their diabetes in the hospital overnight for minor surgery. One of the in-hospital interns reviewed their current medications and…
entered data into the system to continue with their ongoing medications including a rapid acting insulin prior to meals. The intern wrote the prescription for 3 U’s of insulin 10 minutes prior to meals.
The nurse read the prescription as 30, taking the U to mean zero (30 instead of 3U). I happened to walk into the patient’s room to check up on them and reviewed the chart as the nurse was filling the syringe with insulin. I noticed that she pulled back the plunger to load the 50 unit syringe 2/3’s of the way out. So I just questioned her as to the number of units she was going to inject and she said 30 units, which I immediately corrected to 3 units.
There is a reason that the number one drug for errors is insulin. There are just too many possibilities for errors when insulin is involved. This is just one of them. So the lesson learned in this case is never use the abbreviated symbol of “U” or “IU” for units. You should always spell out the word “UNITS”!
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